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Investments in Unconsolidated Entities | 9 Months Ended
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Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract] |
Investments in Unconsolidated Entities | White Mountains’s investments in unconsolidated entities are included within other long-term investments and consist of investments in common equity securities or similar instruments, which give White Mountains the ability to exert significant influence over the investee’s operating and financial policies (“equity method eligible unconsolidated entities”). Such investments may be accounted for under either the equity method or, alternatively, White Mountains may elect to account for them under the fair value option. The following table presents the carrying values of investments in equity method eligible unconsolidated entities recorded within other long-term investments:
Millions |  | September 30, 2018 |  | December 31, 2017
Equity method eligible private equity securities, at fair value |  | $ | 97.3 |  |  | $ | 58.0 |
Investments, accounted for under the equity method |  | 11.6 |  |  | 4.6 |
Total investments in equity method eligible unconsolidated entities |  | 108.9 |  |  | 62.6 |
Other unconsolidated investments (1) |  | 180.8 |  |  | 146.2 |
Total other long-term investments |  | $ | 289.7 |  |  | $ | 208.8 |
(1) Consists of other long-term investments that are not equity method eligible. The following table presents White Mountains’s investments in equity method eligible unconsolidated entities as of September 30, 2018 and December 31, 2017:
|  | Ownership Interest |  |
Investee |  | September 30, 2018 |  | December 31, 2017 |  | Instrument Held
PassportCard (1) |  | 50.0% |  | 50.0% |  | Common shares
DavidShield (1) |  | 50.0% |  | — |  | Common shares
Kudu |  | 49.5% |  | — |  | Units
durchblicker |  | 45.0% |  | 45.0% |  | Common shares
Compare.com |  | 22.1% |  | 22.1% |  | Common shares
Tuckerman Capital Fund III, L.P. |  | 21.8% |  | 21.3% |  | Limited partnership interest
(1) At September 30, 2018, White Mountains's ownership interest in PassportCard comprised a 25% direct ownership interest and a 25% indirect interest through DavidShield. At December 31, 2017, White Mountains's ownership interest was a 50% direct ownership interest. See Note 2 — “Significant Transactions”. For the three and nine months ending September 30, 2018, White Mountains recorded $4.2 million and $8.1 million associated with Tuckerman Capital Fund III L.P. (“Tuckerman III, L.P.”) within unrealized investment gains (losses) and net investment income. Financial data submitted by Tuckerman III L.P. is on a one-quarter lag. For the three and nine trailing months ended June 30, 2018, Tuckerman III L.P.’s total net income was $31.9 million and $43.7 million. For the three and nine trailing months ended June 30, 2017, Tuckerman III L.P.’s total net income was $3.2 million and $7.1 million. As of June 30, 2018 and December 31, 2017, Tuckerman III, L.P.’s total assets were $61.9 million and $21.8 million.

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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